Wondershare PDFelement - All-in-one PDF editor
Explain Everything - Explain Everything is an easy-to-use design, screencasting, and interactive whiteboard tool that...
Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.
Microsoft Whiteboard - The canvas where ideas, content, & people come together.
Foxit PhantomPDF - Edit PDF files with our feature-rich PDF Editor. Download Foxit PDF Editor to convert, sign, scan / OCR & more. A speedy PDF Editor alternative to Adobe Acrobat.
Conceptboard - Instant Whiteboards for Teams & Projects